Preprints
https://doi.org/10.5194/tc-2022-59
https://doi.org/10.5194/tc-2022-59
 
25 May 2022
25 May 2022
Status: this preprint is currently under review for the journal TC.

Ice Sheet and Sea Ice Ultrawideband Microwave Airborne eXperiment (ISSIUMAX) in Antarctica: first results from Terra Nova Bay

Marco Brogioni1, Mark J. Andrews2, Stefano Urbini3, Kenneth C. Jezek4, Joel T. Johnson2, Marion Leduc-Leballeur1, Giovanni Macelloni1, Stephen F. Ackley5, Alexandra Bringer2, Ludovic Brucker6, Oguz Demir2, Giacomo Fontanelli1, Caglar Yardim2, Lars Kaleschke7, Francesco Montomoli1, Leung Tsang8, Silvia Becagli9, and Massimo Frezzotti10 Marco Brogioni et al.
  • 1"N.Carrara" Institute of Applied Physics - National Reasearch Council, IFAC-CNR, Sesto Fiorentino, 50019, Italy
  • 2Electroscience Laboratory, The Ohio State University, Columbus, OH 43212, USA
  • 3Istituto Nazionale di Geofisica e Vulcanologia - INGV, Rome, 00143, Italy
  • 4Byrd Polar and Climate Research Center, The Ohio State University, Colombus, OH 43210, USA
  • 5Department of Earth and Planetary Sciences, University of Texas at San Antonio, San Antonio, TX 78249, USA
  • 6Center for Satellite Application and Research NOAA/NESDIS and the U.S. National Ice Center, College Park, MD 20740, USA
  • 7Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany
  • 8Radiation Laboratory, University of Michigan, Ann Arbor, MI 48109-2122, USA
  • 9"U. Schiff" Department of Chemistry, University of Florence, Sesto Fiorentino, 50019, Italy
  • 10Department of Science, Università degli Studi Roma Tre, Rome, 00154, Italy

Abstract. An airborne microwave wide-band radiometer (500–2000 MHz) was operated for the first time in Antarctica to better understand the emission properties of sea ice, outlet glaciers and the interior ice sheet from Terra Nova Bay to Dome C. The different glaciological regimes were revealed to exhibit unique spectral signatures in this portion of the microwave spectrum. Generally, the brightness temperatures over the inland ice sheet were warmest at the lowest frequencies consistent with models that predict that those channels sensed the deeper, warmer parts of the ice sheet. Spectra along the lengths of outlet glaciers were modulated by the deposition and erosion of snow, driven by strong katabatic winds. Similar to previous experiments in Greenland, the brightness temperatures across the frequency band were low in crevasse areas. Variations in brightness temperature were consistent with spatial changes in sea ice type identified in satellite imagery and in situ ground penetrating radar data. The results contribute to a better understanding of the utility of microwave wide-band radiometry for cryospheric studies and also advance knowledge of the important physics underlying existing L-band radiometers operating in space.

Marco Brogioni et al.

Status: open (until 29 Jul 2022)

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Marco Brogioni et al.

Marco Brogioni et al.

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Short summary
In 2018 the first Antarctic campaign of UWBRAD was carried out. UWBRAD is a new radiometer able to collect microwave spectral signatures over the 0.5-2 GHz thus outperforming existing similar sensors. It allows to probe thicker sea ice and the ice sheets down to the bedrock. In this work we tried to assess the UWBRAD potentials for sea ice, glaciers, ice shelve and buried lakes. Also we highlighted the wider range of information the spectral signature can provide to glaciological studies.